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bb089d7a92
improve `simd_select` error message when used with invalid mask type
followup to https://github.com/rust-lang/rust/pull/137828
This PR improves the error message for an invalid `simd_select` mask type, and adds testing for `simd_scatter` and `simd_gather` being used with invalid mask types.
the `simd_masked_load` and `simd_masked_store` intrinsics already generated a better error message:
0c72c0d11a/tests/ui/simd/masked-load-store-build-fail.rs (L24-L37)
r? `@workingjubilee`
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